[vFBLT] VRayVFBLayerTree- 1 per pass
allows to have different VRay framebuffer Layers(VRay 5) or Global Color Correction(VRay Next) per pass.
You can capture from the current VRayFB or load from a file. Them renderStacks will embed in the renderStacks depot max file.
Again when you load a .vfbl or .vccglb file, it is not a live link. The data will be loaded and embedded in the current max file.
When you activate a pass, this pmodifier will temporarily generate .vfbl or .vccglb file from the depot data and load it.